City of Frisco Engineering Standards

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Engineering Standards Version 6/19/12 5.1.5 Water Main Sizing A. Water mains shall be sized in accordance with the Water Distribution System Master Plan. B. The following criteria shall be used to size water mains. 1. Average daily water demands less than 80,000 gallons per day: a. Single Family Residential i. Water mains shall be a minimum of 8”. ii. 12” water mains are required to serve the development and shall be located along collector streets. b. Multi-Family Residential i. Water mains shall be a minimum of 8” and shall be extended to provide service to adjacent properties. ii. Water mains greater than 600’ in length or supplying more than one fire hydrant/fire service line shall be 12”. c. Commercial, Schools and Manufacturing i. Looped 8” water mains may be used for fire hydrants located in parking lots and not adjacent to buildings. ii. Water mains greater than 1,000’ in length or supplying more than two fire hydrants/fire service lines shall be a minimum of 12”. 2. Average daily water demands greater than 80,000 gallons per day shall submit the following information: a. Zoning b. Area in acres c. Type of Development d. Number of units and/or building square footage e. Exhibit with connection locations and proposed water main schematic f. Projected Average Daily Water Demands 5.1.6 Water Main Materials A. Polyvinyl Chloride (PVC) Pipe 1. PVC water mains from 4” to 8” in diameter shall be AWWA C900 DR14. 2. PVC water mains 12” in diameter shall be AWWA C900 DR18. Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-4
Engineering Standards Version 6/19/12 3. PVC water mains 16” in diameter and greater shall be AWWA C905 DR18. B. Ductile Iron Pipe Ductile iron water mains 16” in diameter and larger shall be in accordance with ANSI/AWWA C151/A21.50 with a minimum pressure class of 150 psi. It shall be the Engineer’s responsibility to determine whether a higher pressure class is required. C. Fittings All fittings shall be ductile iron and have mechanical restraints and thrust blocking. 5.1.7 Water Services Minimum requirements for water services are as follows: A. Minimum 1” meter and 1” services are required for all residential and commercial services. The size necessary shall be selected based on design calculations of actual demands. B. Twin meters in parallel are not permitted as meter size shall correlate to the line size. Bullhead connections are not permitted. C. Meters 3” and larger are required to be in a concrete vault. D. Domestic or irrigation service connections shall not be allowed on a fire hydrant lead or fire service line. E. A domestic or irrigation service connection shall not exceed 50’ in length. F. A fire service line shall be a minimum of 8”. G. The water meter size shall be the same size as the service line. H. For a water service requiring a vault, a minimum 6” water line shall be required off the water main with a minimum 6” gate valve prior to reducing in size. I. Meter boxes shall be placed within the right-of-way or in a dedicated water easement. J. Meter boxes shall be protected from vehicular traffic with bollards. If not protected by bollards, either a traffic-rated vault or curb is required. K. Meters shall be placed generally in the center of residential lots according to the Standard Details. L. Refer to Approved Material List for acceptable products. 5.1.8 Valves A. Isolation Valves 1. Isolation valves shall be placed on or near street property lines. 2. Isolation valves shall not be over 600’ apart in residential and multi-family areas. Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-5
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City of Frisco Engineering Standards

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